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A156516 as a simple table

n a(n)
2 2
3 12
4 180
5 6058
6 2130020
7 3614728470
8 37525899871744
9 1411771686417771108

[2,12,180,6058,2130020,3614728470,37525899871744,
 1411771686417771108]

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Last modified April 3 17:03 EDT 2020. Contains 333197 sequences. (Running on oeis4.)